config.mk - platform/external/u-boot - Gitiles

 #
 # (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
 # project.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
 # published by the Free Software Foundation; either version 2 of
 # the License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 # MA 02111-1307 USA
 #

 #########################################################################

 # Set shell to bash if possible, otherwise fall back to sh
 SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 	else if [ -x /bin/bash ]; then echo /bin/bash; \
 	else echo sh; fi; fi)

 export	SHELL

 ifeq ($(CURDIR),$(SRCTREE))
 dir :=
 else
 dir := $(subst $(SRCTREE)/,,$(CURDIR))
 endif

 ifneq ($(OBJTREE),$(SRCTREE))
 # Create object files for SPL in a separate directory
 ifeq ($(CONFIG_SPL_BUILD),y)
 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
 else
 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
 endif
 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)

 $(shell mkdir -p $(obj))
 else
 # Create object files for SPL in a separate directory
 ifeq ($(CONFIG_SPL_BUILD),y)
 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)

 $(shell mkdir -p $(obj))
 else
 obj :=
 endif
 src :=
 endif

 # clean the slate ...
 PLATFORM_RELFLAGS =
 PLATFORM_CPPFLAGS =
 PLATFORM_LDFLAGS =

 #########################################################################

 HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
 		  $(HOSTCPPFLAGS)
 HOSTSTRIP	= strip

 #
 # Mac OS X / Darwin's C preprocessor is Apple specific.  It
 # generates numerous errors and warnings.  We want to bypass it
 # and use GNU C's cpp.	To do this we pass the -traditional-cpp
 # option to the compiler.  Note that the -traditional-cpp flag
 # DOES NOT have the same semantics as GNU C's flag, all it does
 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
 #
 # Apple's linker is similar, thanks to the new 2 stage linking
 # multiple symbol definitions are treated as errors, hence the
 # -multiply_defined suppress option to turn off this error.
 #

 ifeq ($(HOSTOS),darwin)
 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
 DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
 DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')

 os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
 	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)

 # Snow Leopards build environment has no longer restrictions as described above
 HOSTCC		 = $(call os_x_before, 10, 5, "cc", "gcc")
 HOSTCFLAGS	+= $(call os_x_before, 10, 4, "-traditional-cpp")
 HOSTLDFLAGS	+= $(call os_x_before, 10, 5, "-multiply_defined suppress")
 else
 HOSTCC		= gcc
 endif

 ifeq ($(HOSTOS),cygwin)
 HOSTCFLAGS	+= -ansi
 endif

 # We build some files with extra pedantic flags to try to minimize things
 # that won't build on some weird host compiler -- though there are lots of
 # exceptions for files that aren't complaint.

 HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
 HOSTCFLAGS	+= -pedantic

 #########################################################################
 #
 # Option checker, gcc version (courtesy linux kernel) to ensure
 # only supported compiler options are used
 #
 CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
 CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o

 -include $(CC_OPTIONS_CACHE_FILE)

 cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
 		if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
 		> /dev/null 2>&1; then \
 		echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
 		echo "$(1)"; fi)

 ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
 cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
 else
 cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
 		$(if $(call cc-option-sys,$1),$1,$2)))
 endif

 # cc-version
 # Usage gcc-ver := $(call cc-version)
 cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
 binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS))

 #
 # Include the make variables (CC, etc...)
 #
 AS	= $(CROSS_COMPILE)as

 # Always use GNU ld
 LD	= $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
 		then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)

 CC	= $(CROSS_COMPILE)gcc
 CPP	= $(CC) -E
 AR	= $(CROSS_COMPILE)ar
 NM	= $(CROSS_COMPILE)nm
 LDR	= $(CROSS_COMPILE)ldr
 STRIP	= $(CROSS_COMPILE)strip
 OBJCOPY = $(CROSS_COMPILE)objcopy
 OBJDUMP = $(CROSS_COMPILE)objdump
 RANLIB	= $(CROSS_COMPILE)RANLIB
 DTC	= dtc
 CHECK	= sparse

 #########################################################################

 # Load generated board configuration
 sinclude $(OBJTREE)/include/autoconf.mk
 sinclude $(OBJTREE)/include/config.mk

 # Some architecture config.mk files need to know what CPUDIR is set to,
 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
 # CPU-specific code.
 CPUDIR=arch/$(ARCH)/cpu/$(CPU)
 ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
 CPUDIR=arch/$(ARCH)/cpu
 endif

 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk	# include architecture dependend rules
 sinclude $(TOPDIR)/$(CPUDIR)/config.mk		# include  CPU	specific rules

 ifdef	SOC
 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk	# include  SoC	specific rules
 endif
 ifdef	VENDOR
 BOARDDIR = $(VENDOR)/$(BOARD)
 else
 BOARDDIR = $(BOARD)
 endif
 ifdef	BOARD
 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk	# include board specific rules
 endif

 #########################################################################

 # We don't actually use $(ARFLAGS) anywhere anymore, so catch people
 # who are porting old code to latest mainline but not updating $(AR).
 ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
 RELFLAGS= $(PLATFORM_RELFLAGS)
 DBGFLAGS= -g # -DDEBUG
 OPTFLAGS= -Os #-fomit-frame-pointer

 OBJCFLAGS += --gap-fill=0xff

 gccincdir := $(shell $(CC) -print-file-name=include)

 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)		\
 	-D__KERNEL__

 # Enable garbage collection of un-used sections for SPL
 ifeq ($(CONFIG_SPL_BUILD),y)
 CPPFLAGS += -ffunction-sections -fdata-sections
 LDFLAGS_FINAL += --gc-sections
 endif

 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 endif

 ifneq ($(CONFIG_SPL_TEXT_BASE),)
 CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE)
 endif

 ifneq ($(CONFIG_SPL_PAD_TO),)
 CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO)
 endif

 ifneq ($(CONFIG_UBOOT_PAD_TO),)
 CPPFLAGS += -DCONFIG_UBOOT_PAD_TO=$(CONFIG_UBOOT_PAD_TO)
 endif

 ifeq ($(CONFIG_SPL_BUILD),y)
 CPPFLAGS += -DCONFIG_SPL_BUILD
 endif

 # Does this architecture support generic board init?
 ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
 ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
 $(error Your architecture does not support generic board. Please undefined \
 CONFIG_SYS_GENERIC_BOARD in your board config file)
 endif
 endif

 ifneq ($(RESET_VECTOR_ADDRESS),)
 CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
 endif

 ifneq ($(OBJTREE),$(SRCTREE))
 CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 endif

 CPPFLAGS += -I$(TOPDIR)/include
 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc	\
 	-isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)

 ifdef BUILD_TAG
 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
 	-DBUILD_TAG='"$(BUILD_TAG)"'
 else
 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 endif

 CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
 CFLAGS += $(CFLAGS_SSP)
 # Some toolchains enable security related warning flags by default,
 # but they don't make much sense in the u-boot world, so disable them.
 CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
 	       $(call cc-option,-Wno-format-security)
 CFLAGS += $(CFLAGS_WARN)

 # Report stack usage if supported
 CFLAGS_STACK := $(call cc-option,-fstack-usage)
 CFLAGS += $(CFLAGS_STACK)

 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 # option to the assembler.
 AFLAGS_DEBUG :=

 # turn jbsr into jsr for m68k
 ifeq ($(ARCH),m68k)
 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 AFLAGS_DEBUG := -Wa,-gstabs,-S
 endif
 endif

 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)

 LDFLAGS += $(PLATFORM_LDFLAGS)
 LDFLAGS_FINAL += -Bstatic

 LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 endif

 LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
 ifneq ($(CONFIG_SPL_TEXT_BASE),)
 LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
 endif

 # Linus' kernel sanity checking tool
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
                   -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)

 # Location of a usable BFD library, where we define "usable" as
 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 # - When cross-compiling: the root of the cross-environment
 # - Linux/ppc (native): /usr
 # - NetBSD/ppc (native): you lose ... (must extract these from the
 #   binutils build directory, plus the native and U-Boot include
 #   files don't like each other)
 #
 # So far, this is used only by tools/gdb/Makefile.

 ifeq ($(HOSTOS),darwin)
 BFD_ROOT_DIR =		/usr/local/tools
 else
 ifeq ($(HOSTARCH),$(ARCH))
 # native
 BFD_ROOT_DIR =		/usr
 else
 #BFD_ROOT_DIR =		/LinuxPPC/CDK		# Linux/i386
 #BFD_ROOT_DIR =		/usr/pkg/cross		# NetBSD/i386
 BFD_ROOT_DIR =		/opt/powerpc
 endif
 endif

 #########################################################################

 export	HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
 	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 export	CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS

 #########################################################################

 # Allow boards to use custom optimize flags on a per dir/file basis
 BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
 ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
 EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
 ALL_CFLAGS += $(EXTRA_CPPFLAGS)

 # The _DEP version uses the $< file target (for dependency generation)
 # See rules.mk
 EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
 		$(CPPFLAGS_$(BCURDIR))
 $(obj)%.s:	%.S
 	$(CPP) $(ALL_AFLAGS) -o $@ $<
 $(obj)%.o:	%.S
 	$(CC)  $(ALL_AFLAGS) -o $@ $< -c
 $(obj)%.o:	%.c
 ifneq ($(CHECKSRC),0)
 	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
 endif
 	$(CC)  $(ALL_CFLAGS) -o $@ $< -c
 $(obj)%.i:	%.c
 	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
 $(obj)%.s:	%.c
 	$(CC)  $(ALL_CFLAGS) -o $@ $< -c -S

 #########################################################################

 # If the list of objects to link is empty, just create an empty built-in.o
 cmd_link_o_target = $(if $(strip $1),\
 		      $(LD) $(LDFLAGS) -r -o $@ $1,\
 		      rm -f $@; $(AR) rcs $@ )

 #########################################################################
	#
	# (C) Copyright 2000-2006
	# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	#
	# See file CREDITS for list of people who contributed to this
	# project.
	#
	# This program is free software; you can redistribute it and/or
	# modify it under the terms of the GNU General Public License as
	# published by the Free Software Foundation; either version 2 of
	# the License, or (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program; if not, write to the Free Software
	# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	# MA 02111-1307 USA
	#

	#########################################################################

	# Set shell to bash if possible, otherwise fall back to sh
	SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
	else if [ -x /bin/bash ]; then echo /bin/bash; \
	else echo sh; fi; fi)

	export SHELL

	ifeq ($(CURDIR),$(SRCTREE))
	dir :=
	else
	dir := $(subst $(SRCTREE)/,,$(CURDIR))
	endif

	ifneq ($(OBJTREE),$(SRCTREE))
	# Create object files for SPL in a separate directory
	ifeq ($(CONFIG_SPL_BUILD),y)
	obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
	else
	obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
	endif
	src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)

	$(shell mkdir -p $(obj))
	else
	# Create object files for SPL in a separate directory
	ifeq ($(CONFIG_SPL_BUILD),y)
	obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)

	$(shell mkdir -p $(obj))
	else
	obj :=
	endif
	src :=
	endif

	# clean the slate ...
	PLATFORM_RELFLAGS =
	PLATFORM_CPPFLAGS =
	PLATFORM_LDFLAGS =

	#########################################################################

	HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
	$(HOSTCPPFLAGS)
	HOSTSTRIP = strip

	#
	# Mac OS X / Darwin's C preprocessor is Apple specific. It
	# generates numerous errors and warnings. We want to bypass it
	# and use GNU C's cpp. To do this we pass the -traditional-cpp
	# option to the compiler. Note that the -traditional-cpp flag
	# DOES NOT have the same semantics as GNU C's flag, all it does
	# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
	#
	# Apple's linker is similar, thanks to the new 2 stage linking
	# multiple symbol definitions are treated as errors, hence the
	# -multiply_defined suppress option to turn off this error.
	#

	ifeq ($(HOSTOS),darwin)
	# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
	DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion \| cut -f 1 -d '.')
	DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion \| cut -f 2 -d '.')

	os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)

	# Snow Leopards build environment has no longer restrictions as described above
	HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc")
	HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
	HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
	else
	HOSTCC = gcc
	endif

	ifeq ($(HOSTOS),cygwin)
	HOSTCFLAGS += -ansi
	endif

	# We build some files with extra pedantic flags to try to minimize things
	# that won't build on some weird host compiler -- though there are lots of
	# exceptions for files that aren't complaint.

	HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
	HOSTCFLAGS += -pedantic

	#########################################################################
	#
	# Option checker, gcc version (courtesy linux kernel) to ensure
	# only supported compiler options are used
	#
	CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
	CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o

	-include $(CC_OPTIONS_CACHE_FILE)

	cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
	if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
	> /dev/null 2>&1; then \
	echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
	echo "$(1)"; fi)

	ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
	cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
	else
	cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
	$(if $(call cc-option-sys,$1),$1,$2)))
	endif

	# cc-version
	# Usage gcc-ver := $(call cc-version)
	cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
	binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS))

	#
	# Include the make variables (CC, etc...)
	#
	AS = $(CROSS_COMPILE)as

	# Always use GNU ld
	LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
	then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)

	CC = $(CROSS_COMPILE)gcc
	CPP = $(CC) -E
	AR = $(CROSS_COMPILE)ar
	NM = $(CROSS_COMPILE)nm
	LDR = $(CROSS_COMPILE)ldr
	STRIP = $(CROSS_COMPILE)strip
	OBJCOPY = $(CROSS_COMPILE)objcopy
	OBJDUMP = $(CROSS_COMPILE)objdump
	RANLIB = $(CROSS_COMPILE)RANLIB
	DTC = dtc
	CHECK = sparse

	#########################################################################

	# Load generated board configuration
	sinclude $(OBJTREE)/include/autoconf.mk
	sinclude $(OBJTREE)/include/config.mk

	# Some architecture config.mk files need to know what CPUDIR is set to,
	# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
	# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
	# CPU-specific code.
	CPUDIR=arch/$(ARCH)/cpu/$(CPU)
	ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
	CPUDIR=arch/$(ARCH)/cpu
	endif

	sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules
	sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules

	ifdef SOC
	sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
	endif
	ifdef VENDOR
	BOARDDIR = $(VENDOR)/$(BOARD)
	else
	BOARDDIR = $(BOARD)
	endif
	ifdef BOARD
	sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
	endif

	#########################################################################

	# We don't actually use $(ARFLAGS) anywhere anymore, so catch people
	# who are porting old code to latest mainline but not updating $(AR).
	ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
	RELFLAGS= $(PLATFORM_RELFLAGS)
	DBGFLAGS= -g # -DDEBUG
	OPTFLAGS= -Os #-fomit-frame-pointer

	OBJCFLAGS += --gap-fill=0xff

	gccincdir := $(shell $(CC) -print-file-name=include)

	CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \
	-D__KERNEL__

	# Enable garbage collection of un-used sections for SPL
	ifeq ($(CONFIG_SPL_BUILD),y)
	CPPFLAGS += -ffunction-sections -fdata-sections
	LDFLAGS_FINAL += --gc-sections
	endif

	ifneq ($(CONFIG_SYS_TEXT_BASE),)
	CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
	endif

	ifneq ($(CONFIG_SPL_TEXT_BASE),)
	CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE)
	endif

	ifneq ($(CONFIG_SPL_PAD_TO),)
	CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO)
	endif

	ifneq ($(CONFIG_UBOOT_PAD_TO),)
	CPPFLAGS += -DCONFIG_UBOOT_PAD_TO=$(CONFIG_UBOOT_PAD_TO)
	endif

	ifeq ($(CONFIG_SPL_BUILD),y)
	CPPFLAGS += -DCONFIG_SPL_BUILD
	endif

	# Does this architecture support generic board init?
	ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
	ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
	$(error Your architecture does not support generic board. Please undefined \
	CONFIG_SYS_GENERIC_BOARD in your board config file)
	endif
	endif

	ifneq ($(RESET_VECTOR_ADDRESS),)
	CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
	endif

	ifneq ($(OBJTREE),$(SRCTREE))
	CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
	endif

	CPPFLAGS += -I$(TOPDIR)/include
	CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \
	-isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)

	ifdef BUILD_TAG
	CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
	-DBUILD_TAG='"$(BUILD_TAG)"'
	else
	CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
	endif

	CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
	CFLAGS += $(CFLAGS_SSP)
	# Some toolchains enable security related warning flags by default,
	# but they don't make much sense in the u-boot world, so disable them.
	CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
	$(call cc-option,-Wno-format-security)
	CFLAGS += $(CFLAGS_WARN)

	# Report stack usage if supported
	CFLAGS_STACK := $(call cc-option,-fstack-usage)
	CFLAGS += $(CFLAGS_STACK)

	# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
	# option to the assembler.
	AFLAGS_DEBUG :=

	# turn jbsr into jsr for m68k
	ifeq ($(ARCH),m68k)
	ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
	AFLAGS_DEBUG := -Wa,-gstabs,-S
	endif
	endif

	AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)

	LDFLAGS += $(PLATFORM_LDFLAGS)
	LDFLAGS_FINAL += -Bstatic

	LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
	ifneq ($(CONFIG_SYS_TEXT_BASE),)
	LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
	endif

	LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
	ifneq ($(CONFIG_SPL_TEXT_BASE),)
	LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
	endif

	# Linus' kernel sanity checking tool
	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
	-Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)

	# Location of a usable BFD library, where we define "usable" as
	# "built for ${HOST}, supports ${TARGET}". Sensible values are
	# - When cross-compiling: the root of the cross-environment
	# - Linux/ppc (native): /usr
	# - NetBSD/ppc (native): you lose ... (must extract these from the
	# binutils build directory, plus the native and U-Boot include
	# files don't like each other)
	#
	# So far, this is used only by tools/gdb/Makefile.

	ifeq ($(HOSTOS),darwin)
	BFD_ROOT_DIR = /usr/local/tools
	else
	ifeq ($(HOSTARCH),$(ARCH))
	# native
	BFD_ROOT_DIR = /usr
	else
	#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386
	#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386
	BFD_ROOT_DIR = /opt/powerpc
	endif
	endif

	#########################################################################

	export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
	export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS

	#########################################################################

	# Allow boards to use custom optimize flags on a per dir/file basis
	BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
	ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
	ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
	EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
	ALL_CFLAGS += $(EXTRA_CPPFLAGS)

	# The _DEP version uses the $< file target (for dependency generation)
	# See rules.mk
	EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
	$(CPPFLAGS_$(BCURDIR))
	$(obj)%.s: %.S
	$(CPP) $(ALL_AFLAGS) -o $@ $<
	$(obj)%.o: %.S
	$(CC) $(ALL_AFLAGS) -o $@ $< -c
	$(obj)%.o: %.c
	ifneq ($(CHECKSRC),0)
	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
	endif
	$(CC) $(ALL_CFLAGS) -o $@ $< -c
	$(obj)%.i: %.c
	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
	$(obj)%.s: %.c
	$(CC) $(ALL_CFLAGS) -o $@ $< -c -S

	#########################################################################

	# If the list of objects to link is empty, just create an empty built-in.o
	cmd_link_o_target = $(if $(strip $1),\
	$(LD) $(LDFLAGS) -r -o $@ $1,\
	rm -f $@; $(AR) rcs $@ )

	#########################################################################